Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67da1399cb78163…

MALICIOUS

PDF

86.5 KB Created: 2021-07-16 15:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ed01c9545b2fa3278e55e7d211785f3 SHA-1: de916e45f0022881747ba923028e29a27a0c70ec SHA-256: b67da1399cb781636b6023957c407c6f147b66e24238b3f9662748b776aca2d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically classifying it as 'Pdf.Phishing.Trojan'. The primary attack pattern involves directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/mumow.pdf In PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b563d8e1cf8---62366259631.pdfIn PDF document text
    • https://windsbs.biz/files/file/pumokuluj.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/2856192185.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/31292403248.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/dakidanujavufureloraruge.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b92c6882---52783975497.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/25884844745.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3eef092a---regijelafexi.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/tadaganuxonokuwadi.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba162b2e9---47731748351.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/55664060643.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/35bc2aa45b1775918b668290fbef35e2/17798228652.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/990b7beae4de6c815aeccba46302a71b/67768832613.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/568032071a2ad34d6d42b9d8e4cccb57/15203631177.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/12862422508.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/18679892377.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8f273e3f6fae880951f55f77370843b2/mupejebufisadomiwapig.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4ii6iv95tbtta9pgi42ivhqo00/91197565123.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/lojigokogofufikixoluvuk.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/metini.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c887d01534e---55479508833.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/lisopaxoli.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/sisekevajamotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+online+bengali+book+reading+websitesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 10716 bytes
SHA-256: dd8a332e5426771e163a14b0e7b9bc23b8315ef624b2f6b16e33916ad4898c59
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 19428 bytes
SHA-256: 6a76b6b00c77b67ae54d93f1c387e78f25ec0248a152bb367e0f7a275ebadd19

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